Department of Conservative Dentistry, Dental Materials Laboratory, School of Dentistry, Universidade Federal do Rio Grande do Sul.
Published: February 2019
AI Article Synopsis
Article Abstract
The evaluation of the photocatalysis of visible light activated titanium dioxide employed in hydrogen peroxide (HO) was carried using seven HO solutions (3.5 and 35%) and/or methylene blue (MB), with or without light irradiation (LI); the absorbance of MB was the bleaching indicator. Color analysis was performed on bovine teeth (n=12) using two different concentrations of HO, 6 and 35% associated with titanium dioxide (TiO). Data were analyzed with one and two-way ANOVA, and significance level of p<0.05. Solutions containing MB, HO at 3.5 or 35%, and TiO, followed by LI, showed significant difference when compared with other groups. Greater MB reduction was found in 35% concentration. HO 35%+TiO gel showed no difference in comparison to control group. All groups for the color analysis assay showed ΔE higher than 3.3. In conclusion, TiO and HO association is a promisor alternative for reducing the clinical time of in-office dental bleaching.
Industrial organic dyes represent a significant portion of pollutants discharged into the environment, particularly by the textile industry. These compounds pose serious threats to living organisms due to their high toxicity. Various techniques have been explored for the degradation of organic dyes, among which heterogeneous photocatalysis utilising titanium dioxide (TiO) stands out as a promising technology.
College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China. Electronic address:
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